interest burden; interest cost
Refers to the financial weight of interest payments, often used in economic or business contexts.
When the interest burden increases, corporate profits are squeezed.
I'm looking for ways to reduce the interest burden on my mortgage.
利払い refers specifically to the act of paying interest, while 金利負担 emphasizes the burden or cost aspect of those payments.
Compound of 金利 (interest rate) and 負担 (burden).